TkRat is a graphical Mail User Agent (MUA) which handles MIME. It is
mainly written in C but the user interface is done in tcl/tk. The
following is a non exhaustive list of the capabilities:

    * Supports disconnected IMAP folders
    * Keeps track of number of unread messages in multiple folders
    * Multilingual interface
    * Message database
    * Virtual folders
    * Message hold
    * Watcher
    * Interface to the rest of the mail world
    * Supports Delivery Status Notifications
    * Composing
    * MIME support
    * Supports PGP/MIME
